Room setting: new amp or new speakers?

Both, really.

I had the Venere 1.5s in my home for a week, my local dealer let me try them. I don’t know why but they were very forgettable, to put it politely - completely lifeless.

I have the same feeling for your Yamaha model, far from the potential to provide you with a lot of joy. (If it were Denon from the late 90s, I’d be excited)

You could get some money for the speakers and that would let you buy an integrated amp too. NAD, Cambridge Audio, Quad, Rotel have decent, quality models in the $800 range. (Although you may not be in the US but the prices must be comparable)

For speakers, Audio Notes is one of the most the highly regarded brands for sure - and easy to drive. If you want to be overwhelmed: https://speakerchoices.com/

Don’t spend any money on new speakers, amps, etc until you can fix your placement problem. Once you you have the placement problem sorted then look at decent floorstanding speakers or standmount speakers plus a sub or two.

The room, placement and the speakers are easily the largest part of the good sound equation. Everything else is gravy.

Speakers then amp then preamp then streamer dac then cabels.you can go cheap like fosi audio class d or schitt or Amazon chifi or hit the used market.iseldom buy new to stretch my $. Enjoy the search stay healthy.

Agree with getting your room setup first.  It will have the most impact on what you hear coming out of your system.  I would then upgrade your source.  Moving from the Bluesound Node N130 to an Innuos Zen Mk3 streamer and a Holo Audio Cyan 2 DAC made my speakers sound different.  So much more detailed.  Hearing things I didn’t before with the same setup.  Changing the source had More impact for me than the preamp, amp and cables.  I also play CDs and upgrading the player didn’t have as much impact as changing the streamer and DAC.  Next the speakers.  Suggest floor standing with your room to fill the space with sound.  A good pair can work without a sub unless you need the room to shake for movies.  I have a pair of Arendal 1723 towers.  Finally, Make sure your amp can power the speakers you choose so they can produce the volume you want at no more than 50% volume setting, to prevent clipping. What you get will depend on your budget.

In my experience the 3 most important factors are:

1. Room setup 

2. Source - most importantly for streaming 

3. Speakers

Enjoy your new musical journey.  It’s a fun part of this hobby.  And as Hans says, enjoy the music!  

As I heard (paraphrased) once visiting a guy from a now defunct local audio club

"if you can't do placement of your speakers which allows them to perform in your space, save your money, get a good source, good amp and some really nice wired headphones".