It's not the best X570 in the world but it certainly isn't going to be a genuine detriment to your lads setup, personally I'd have bought a good B450 for around £100 or a B550 for around £150. Something like the Mortar Max of both the B450 and B550 range for example, it'd have been money saved you could put elsewhere. For an X570 at around the £200 range the Gigabyte Elite or MSI Tomahawk would have been superior purchases. Depending on how much you paid for it and if you bought your motherboard local and/or it's easy to return I'd actually suggest doing so, it'd allow you to buy a nice new monitor outright with the savings while also getting an essentially superior motherboard.
You really should have signed up here and asked earlier as we'd have been able to help much more!
Regardless, as I mentioned earlier given you're doing this for the first time and have the initiative to not only build yourself but source both new and second hand components I think you've actually done quite a good job compared to 95% of what I've seen from people trying similar.