If you think the bitcoin fee is too expensive, I suggest you convert your bitcoin to ethereum/doge/litecoin,
and the total fee which you paid by converting your bitcoin is more smaller than the current bitcoin's standard fee.

the reasons for the current high fee when converted to FIAT are dual:
1) the fact that the current transaction volume is higher than the capacity of the blocks
2) bitcoin does not care about the fiat value... The current fiat value went trough the roof, so when you payed a 0.001 BTC fee in the past, the fiat equivalent was much lower than when you're paying a 0.001 BTC fee right now

I do agree that the fiat price of an average transaction fee is waaaay higher than it *should* be, but like others have already said: the lightning network is being developed, and if more and more people would switch to a segwit wallet, the problem should also become less pronounced.

Due to the increase price of bitcoin value the transaction fees
or getting very high, I hope this issue can get solved by the bitcoin
online bank merchants. But I think it will be fine after the bitcoin
price gets stable.

I hope that will be some softforks to increase transaction speed and decrease fees, because it is really high now.

How to manage BTC transaction fee. To all all costs in advance & be sure that transaction will be transmitted. Any hints?

I think that the load on the network will not decrease. In time, it will even increase.
A comprehensive solution to this problem is needed

After last fork bitcoin transaction fees recovered somehow so after transaction are that harder to make and ethereum gas price also good in the every online wallet providers. But suddenly last week onwards gas price has been increased and most of the ethereum network transaction are delayed with the high fee as well.
I am using blockchain wallet I see the transaction fees is around 15 USD and little more for every transaction. This seems ridiculous by the wallet provider.

yeah is high, because there is only 1mb per block allowed in the first place.  So you have think every 10 minutes 1mb of data
is allowed.  Its a swindling amount of data and also the miners will always pick the high Transaction fees so is like people are bidding against each other just send their bitcoins.

So what man i don't understand why even complain you all speculate and hope that btc becomes $20k $40k god knows what all weird amount and when it reaches that most of you regret for not purchasing earlier and start complaining about fees.

Increase in price will come at a cost and that is the fees if you are a penny holder go invest in alts btc isn't for you there are 100's of alts which have fast network and really low fees.

You dumb online wallets will have higher fees because you don't have a option they want the speed to be a little faster with desktop wallet you can save a lot more.