In contrast to most of the other comments, which always find funds stupid because they are "far too expensive", I would recommend continuing to hold Deka GlobalChampions. Why? I ran it against an MSCI World reference ETF according to various criteria that are relevant to me. And here is my result:
1-year price performance: Deka better (30% vs. 23%)
3-year performance: Deka better (34 to 30%)
5-year performance: Deka better (78 to 71%)
10-year performance: Deka better (157 vs. 139%)
Volatility in all time ranges (1/3/5/10 years) the same (+-0.5% difference)
Sharpe ratio in all time ranges: Deka better
Trend stability: Deka better
Average drawdown: MSCI minimally better
If the performance is better across all time frames, I am happy to pay internal fund costs for capable employees. In any case, I prefer this to some student programmer who programs it exactly once and otherwise only incurs mini costs for the server, security, electricity and license fees to the index inventors. Even the 0.x% ETF costs are far too expensive for that.
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@financial_genius_20 I also had this view, unfortunately the costs completely eat up these higher returns ... The Global has costs of purchase costs: 3.75%, TER 1.46% and transaction 0.11 %

If I run this against the performance with a savings rate of €150/mth, I get the following with your value development values:

1year: 30% vs. 23%
Deka: 1,800€, growth: 309.33, cost 86.51€ ... Final assets: €2,022.82
ETF: €1,800, growth: €240.79, costs €1.35 ... Final assets: € 2,039.45

3years: 34% vs. 30%
Deka: €5,400, growth: €1021.02, costs €358.1 ... Final assets: €6,062.92
ETF: €5,400, growth: €919.5, costs €12.14 ... Final assets: €6,307.36

Here, after costs, the ETF performs 4.03% better than the fund

5years: 78% vs 71%
Deka: €9,000, growth: €4,522.28, costs €897.7 ... Final assets: €12,624.57
ETF: €9,000, growth: €4,153.52, costs €44.11 ... Final assets: €13,109.41

Here the ETF outperforms the fund by 3.84% after costs
@Schneidi1985 It's just not easy and everyone has to decide for themselves. I have these two stocks (Deka, worldETf) running in parallel with 1x investment and Deka is doing better for me if I were to sell now. With useful brokers who have several OTC and stock exchanges connected and thus also minimize the buy/sell spreads (purchase costs), this works for me. If it's not good enough in other cases, that's ok too, but this constant bashing that all fund managers are incompetent, parasites and money-cutters and only ETFs are the cheap alternative that makes you happy, I just don't think that's ok. When I then look at money market ETFs that don't even outperform simple overnight money from German branch banks, it just shows that there are hot and junk funds everywhere.