at the same time (as you claim), the competition between miners rises as well
Mining is very simple: if it's worth the investment, you can start mining! Google for a "mining calculator", and you get an estimate on the return for a certain hash rate.
If the turnover per block goes up, miners earn more money in the short term. Longer term, it will lead to new investments, which will lead to an increase in hash rate, which means a new equalibrium is found until it's not profitable to invest anymore for new actors to join.
It's basically standard market economyThis is an oversimplified view on the "standard market economy"
Before anything, if the amount of profit obtained per block goes up, that should necessarily cause the fees to drop, nor rise (in a free market). I guess this is the first thing that should happen if there were a genuine competition between miners. In other words, more profits first increase the competition among existing miners (and only later new miners join in). The reason for this is that miners aim at earning certain margin, if this margin goes up, the competition increases and the margin goes down to its typical level. But it can go down only through lowering fees provided the number of transactions remains more or less the same (which seems to be the case here). But the latter should lead to cancelling out the competition between users (this competition is causing the rise in fee amount they have to pay). To put it differently, both of these things cannot exist simultaneously. That's what my point basically comes down to
There were 10 billboards in the city and 10 advertisers. The billboard holders decided to charge $1 per day for the billboard. Every advertiser was happy with one billboard by paying $1 for it.
Now, 100 foreign companies entered the town (Because Trump was not the mayor, lolz) in the year and they started approaching billboard holders to put their advertisements on the billboard
The main issue with your example is that there may not be any real new foreign company in the town, i.e. the number of transactions seems to be artificially increased via flooding the network with spammy transactions. Really, why would people want to transact more if the fees have risen?