Lost profile data (level, champions, runes)

Hi! The last time I played LoL was almost 4 years ago. I reinstalled the game last week , and I've noticed that my profile level is 5 (now 6, I played two games, was 30 if I remember correctly), I've lost all my unlocked champions, my match history is empty (I had ~100-200 games played) and I have no runes. At least the system remembered what was my avatar in my profile which is nice :) Yes, I connect to the correct server, with the correct account (the only I have). I don't know what should I do, I haven't found anything similar to my problem on the support page ( https://support.riotgames.com/hc/en-us ). Thank you for your help!
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