I thought it would be a good idea to implement a new skill system. In the system, the player can level each skill to level 30 max. Every 5 levels, they get a perk point (or in this case "profession point") that they can put into that skill only. This makes the skills more end-game friendly because it will take a long time to level a skill to level 30. Also gives the ability to learn every profession, which would be logical because a level 30 farmer would know A LOT about farming.
Not sure on the professions side, but I'm fairly sure there's a mod somewhere on Nexus that gives a much higher skill cap, to the point that the 'efficiency' bonuses get to the point you gain energy from using the tool if I recall the posts correctly. Yup, Level Extender available in this mix here: https://www.nexusmods.com/stardewvalley/mods/1471 There's also been some discussion on this previously, available here: https://community.playstarbound.com/threads/increase-the-level-cap-for-all-skills.154044/
