But why was it back then when i sent a bigger amount of bitcoin, my fees were only like under 15 cents etc?
Also i heard Viabtc txaccelorator. Does that work for electrum etc?
Lately the network has been fairly congested and higher fees have been needed for confirms to happen in a timely manner. The fees will grow based on the number of inputs and size of the transaction, but the actual value doesn't matter.
ViaBTC accelerator will work for any transaction and it can help speed up transactions with lower fees. I wouldn't rely on it though as using correct fees is definitely a better approach.