why my voting value decreasing?

Hey mate, I'm not an expert so don't quote me but:

Keep an eye on your estimated worth in your wallet..it will move about a bit. When the market has a big fall like it recently did, a few days will go by and the average price with reach your wallet and your value will fall, with it so will how much your 100% vote is worth
So like new coins are being produced in intervals, so for simplicity lets say there is 100 new coins produced. Across all 600,000+ Steemians, your upvote takes up part of those 100 new coins, as other upvote, say like a whale, in that same period, their percentage is (based on their wallet size) is so much more then yours, your vote worth is reduced.
You know your voting power is constantly going up and down yeah? Just keep an eye on it:https://steemd.com/@ivrmakers
You can see your down to like 60% ish..So basically the general rule of thumb is don't vote more then 10 times a day, or youll deplete...so like now your vote is only worth 60%, you want to let it recover..it recovers a percent or so every couple of hours. Get yourself back up to 100%, watch it. Once there, vote no more then 10 times a day and you won't lose much upvote worth.
Final tip, try to get to 500 SP, when you go to vote then, you will get a special slider appear and you can designate how powerful you want the vote to be (how much money you want to vote someone for) this makes it much easier to control your voting power.

Hope this helps

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