nicocyclo

When it comes to climbing, I am using ROUVY. For me, if I compere it to other apps it simulates the feeling of it the best.

Start with routes that have moderate inclines and then gradually progress to steeper gradients. This progressive approach will help you build strength and endurance. Incorporate interval training into your climbing sessions. Alternate between periods of intense climbing efforts and periods of lower intensity or rest. This mimics the nature of outdoor climbs and improves your ability to push through tough sections. Don't underestimate the importance of rest and recovery. Your muscles need time to recover and grow stronger after intense training sessions. Make sure to include adequate rest and recovery days in your training routine. Hope this will help you

Broctoon

Jen, from that picture, your fit and position on the bike doesn't look bad, except in one area: it's possible that your seat is too high. Hard to say for sure, but it looks like your left knee is almost fully extended, and the pedal isn't all the way at the bottom. Maybe you already know this: if you don't still have a bit of flex in your knee with the pedal at six o'clock, you're sitting too high. If it's an illusion, disregard.

As for gearing, you should be able to put on a cassette that goes bigger. You have a long cage derailleur that can handle at least 32 or even 34 teeth. It looks like 8-speed (maybe 9?). Cassettes in that range are plentiful and not expensive. They're easy to replace, and then you might need just a minor derailleur adjustment, maybe a new chain (also not expensive).

PeteHski

I noticed that too, but hard to say from a single photo. Worth a check for sure.

Iride01 

I thought the leg looked like the saddle was a tad low! Although I don't like formulas for setting a position on a bike. I do find that 109% of my inseam when measured from the top of the pedal at the bottom of it's stroke to the top of the saddle works well for me during times I'm riding into hard efforts. When I slow down and do less riding in my off season, I'll drop it to 106% of my inseam. And maybe coincidentally, putting my heal on the pedal and stretching my leg out straight gets me somewhere between the two.

IMO, legs should be almost straight when viewed from the side. And no rocking of the hips. Maybe for some they need more of a bend to keep from rocking the hips. Whether or not you change your foot angle as you go through the pedal stroke might change that too.