You've reached the late stages of Diablo 2 Resurrected (D2R) - your character is fully geared, high level, and ready to take on the most challenging content. But succeeding in the cutthroat endgame takes strategy, preparation, and optimized play. Here are 10 essential tips to help you dominate Hell difficulty and beyond.

1. Specialize your Build and Gear

Respecing becomes quite costly later on, so commit fully to your chosen playstyle. Min-max your stats, skills, and synergies. Focus on damage, defense, or utility as fits your class. Upgrade your gear with powerful, high-level Diablo 2 items like Griffon's Eye, Enigma runeword, and other ultra rare drops.

2. Max Out Critical Skills

In the endgame, critical hits make a big impact on damage. Maxing skills that boost critical strike chance or damage is highly recommended. This includes skills like Blade Fury, Frost Bolt, Charged Strike, and Jab for certain Diablo 2 Resurrected builds.

3. Invest in Damage Charms

Stack small damage boosts from Grand Charms, Large Charms, and other charms. Look for +skills, +max damage, +elemental damage, etc. These %-based increases add up fast. Popular charms include Annihilus, Hellfire, Light GC with +max damage.

4. Utilize Synergies Fully

Max your damaging primary skills as well as all synergies boosting them. This multiplies your effectiveness dramatically. Study your class and skill tree to unlock full damage potential through synergistic boosts.

5. Craft Useful Items with Runes

Combine runes into powerful Diablo 2 Resurrected runewords like Enigma, Infinity, and Crescent Moon. You can also craft magical items, maphack scrolls, and more using the Cube. Hunt for El, Ist, Mal and other mid-high runes to upgrade your gear.

6. Farm Areas for Specific Loot

Know the best zones to farm for the items you need. For example; Ancient Tunnels for Sorc Orbs, Cow Level for Runes and Bases, Chaos Sanctuary for HRs and keys. Specialization allows maximum efficiency.

7. Trade Strategically

Bartering with other players is an important endgame activity. Trade D2R high runes, charms and gear for items your build needs. Use outside trading sites to research item values and opportunities.

8. Push Difficulty for Better Rewards

The deeper you delve into Hell, the bigger the payoff. Farm bosses, areas with ghost/champion packs for fastest experience and highest item quality drops. Consider Ubers and Dclone for ultimate endgame challenges.

9. Farm Experience Quickly

Raise your character's level for stat point rewards and to use the best gear. Efficient routes in Arcane Sanctuary, Ancient Tunnels and Chaos Sanctuary provide fast experience gains to maximize character potential.

10. Join Groups for Co-op Advantages

Partying up lets you utilize synergies like Barbarian Warcries, Necromancer Curses, and Sorceress skills. Coordinate takedowns of elites and bosses. Trade loot and advice within your team to optimize endgame progression together.

Keep Improving Continually

The endgame is ever-evolving, as you acquire better D2 items and refine your skills. Stay on the hunt for that near-perfect Highlord's Wrath, Thundergod's Vigor or other BiS items to squeeze out incremental power boosts. Try new skills and builds as you collect ideal gear. With diligence, research, practice and trade, you can keep improving to dominate even Diablo himself!

Follow these expert tips and strategies, and you'll be well on your way to true mastery over Diablo 2 Resurrected's epic post-campaign challenges. Happy hunting, and may the RNG gods bless your drops with riches!.

Let me know if you have any other D2R endgame questions. I'd be happy to provide more advice to help crush Hell Baal and beyond. Now get out there and own those monster hordes!