What’s more profitable in cash: table selection or skill improvement?

Both are almost equally important but in my opinion table selection can be slightly more profitable

Skill and knowledge allow a player to overcome limits, but choosing the right table, where players with less technique and skill are very profitable, is also crucial.

Some players only think about being profitable, even at low and stagnant stakes, while others focus on improving their skills and increasing their stakes, consequently becoming profitable at higher stakes.

Long term: skill improvement. Although obviously you can do both

Choosing the right table for sure
On some tables, each pot feels like a war. At quieter tables, the game flows much better and even decisions become simpler.

Developing strong poker skills creates long-term profitability, while good table selection increases short-term earnings by putting you against weaker opponents. Even an average player can perform very well in soft games. The most profitable approach is to keep improving while also avoiding difficult tables whenever possible.