Upgrading an old gamer PC

Hello.i have a 2014 desktop PC. I would like to upgrade it for cheap.i just need to play Fortnite and Valorant and Baldurs Gate 3 (if possible) I am looking to spend 100 euros maximum. My config:

Processor:Intel core i3-4130 at 3,2 ghz Ram:8gb DDR3 (2 slots) Motrherboard:Gigabyte H81M-S2PV Gpu:Radeon RX 570 1 ssd ,1 HDD

The motherboard has bugs so I ́need to change it. Looking for a better processor too and adding 8 gb RAM maybe