You've just joined at the weird part of the season, there have just been 3 deposit bonus which ended last week and now we're in a bit of a lull until people start buying ready for next season.
I've pretty much got my portfolio ready for next season apart from a few transfer speculation players I'm going to cash in on, Maguire, Longstaff etc. I'm quite an active trader, doing a lot of buying and selling, following the latest trends, but I haven't bought/sold any shares since Thursday apart from spending my dividends.
As others have said on here, most of your players will start to rise as we get closer to the start of the season. Unfortunately players like Olmo had a big rise last week due to man utd links, that transfer looks unlikely now so his price has started to fall. Look at players graphs when buying and try to to buy at the top of a spike. You'll find any players linked with Man Utd will always rise at least 20p,this doesn't happen with any other clubs and if those links don't materialise, people will quickly get their money out and bank the profit.