I really like these suggestions and hope they are taken into consideration by the team! Thanks for providing quality input!
Puzzle Journey system - suggestions

Some of your suggestions already exist in a similar form - like increasing points given for a puzzle as you move along the Tiers or giving a bonus for Major Benchmark every once in a while. I've written about what things you get bonuses for in my blog post about Puzzle Journey:
https://www.chess.com/blog/nerlin/puzzle-tiers-leagues-explained
I just got the feature two weeks ago and I love it! The well-made benchmarks and the point system made me addicted to puzzles again. But everything can improve so here is a list of some things to make it even better:
Sudden challenge - When you do puzzles for an hour straight. It can get a little bit repetitive. It has a 1% chance of starting when you start a new puzzle. The idea is that if you solve the puzzles correctly three times. You will get +40 points.
Daily Missions/Quests - We already have the Daily Solver bonus. But, this one will award players that play more than 20 puzzles daily. The quests will refresh every 24 hours and they can be like: Solve Checkmate puzzle 20 times, Get a 6 puzzle streak (can also be 3 or 9), or solve a puzzle within 7 seconds.
Weekly solver - the name speaks for itself. Just like the Daily Solver bonus. Weekly Solver awards players consistency. You will have to get the Daily Solver 7 times in a streak to get this bonus. The bonus is +100 points
Flairs - This will probably be released once the Puzzle Journey system becomes available to PC and IOS. But just in case, a flair to show how much progress you have made could be great!
Flags - After stone league. It starts to be slow getting to the new stage/level. That's why, starting at bronze. Every 5 levels there could be a small percentile bonus that could last forever to keep things fresh. Something like: Hard puzzles give an extra point etc.
But puzzles are about tactics, not points. So this can be mainly beneficial for newcomers and people doing puzzles for fun.