I've been mostly sticking to my usual daily cardio and bodyweight routine at home, and my bum and thighs are definitely getting bigger. I split my favourite pair of jeans, my second favourite have been far too tight for several months, and I can't afford to replace either of them. But it's progress I guess.
We had a lot of rain here a couple of weeks ago which temporarily broke the boiler (landleech knows it keeps happening and doesn't gaf) so I had some cold showers too. For me, they're fine right after a workout but almost like a form of torture when you're already freezing cold.
If you do decide to try monotherapy, gel is unlikely to give you blood e levels high enough to suppress testosterone production if it's applied as directed (upper arms and thighs) https://transfemscience.org/articles/high-dose-transdermal-e2/ You can get higher levels by applying it to your scrotum, but it's quite irritating https://transfemscience.org/articles/genital-e2-application/
If you want testosterone suppression without an AA, E injections are generally the best option. Vanna pharma is based in the uk and is reputable (not sure if I can post a link here, but the url is on diyhrt.cafe). Her product has a lower viscosity than Lena's so you can get away with 29g fixed needles (higher gauge = thinner needle = less pain). You might need 27g or even luer syringes with a low gauge needle for drawing and a higher gauge for injecting if you order injectable e from elsewhere.
Here's the 27g needles I used to use with Lena's EV https://www.exchangesupplies.org/shopdisp_unisharp_fixed_1ml_green_27.php
Drawing the product from the vial can blunten the tip a little, so occasionally an injection would be a little difficult and painful. It could also take several minutes in winter to draw 0.18ml into the syringe due to the higher viscosity.
Here's the 29g I use with Vanna's EV https://www.exchangesupplies.org/shopdisp_Unisharp_fixed_1ml_yellow_29.php
These are thinner and I'm yet to have a painful injection. It takes around 15 seconds to draw 0.18ml at current temperatures (5-15C).
There are several different esters of estradiol available for injection https://transfemscience.org/articles/injectable-e2-meta-analysis/ , but the most common one is estradiol valerate which is often dosed at 0.18ml of 40mg/ml solution (0.18 x 40 = total dose of 7.2mg) every 5 days. Ideally you'd get a blood test after a couple of months so that you can check your levels and adjust your dosage accordingly.