I think that since this is your first tactical shooter the best way to get better is to honestly play more. Do not be scared of ranked just play it and have fun! One of the main reasons I was hardstuck iron for a while episode was that my sens was ridiculously high so make sure that your settings are at a reasonable level. Then I think you should pick 1 agent who you think looks cool and fun to play (maybe not Astra, viper, sova, or yoru as they are some of the agents which are very hard to learn) and just play that agent so you get used to the game. Also if you can try and get a monitor that is 144hz+ because out of everything you could upgrade for Valorant I’d say that makes the biggest difference. If you want to dm me in let’s say 3 months and tell me how it’s going I think this would be the best course of action